I live in California and have guardianship of my 15 year old granddaughter. My husband and I have had her for most of her life. A family that we were very close to moved to Colorado. Our granddaughter has visited them several times and there daughter has come to visit here. I recently found out that the mother has been talking with our granddaughter about moving to live with them in Colorado. She has told our granddaughter that she can make that decision when she is 16 years old. I thought that she would have to be eighteen to make those kinds of decisions. I am very upset about this and need to know if indeed she has a legal right to move to another state against our wishes. I have not spoken to the mother as I wanted to know legally what I can do.